feat: add slack source

src/v0/sources/slack/mapping.json

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+[
+  {
+    "sourceKeys": "event.type",
+    "destKeys": "event"
+  },
+  {
+    "sourceKeys": "event.user.tz",
+    "destKeys": "timezone"
+  },
+  {
+    "sourceKeys": "event.user.profile.email",
+    "destKeys": "context.traits.email"
+  },
+  {
+    "sourceKeys": "event.user.profile.phone",
+    "destKeys": "context.traits.phone"
+  },
+  {
+    "sourceKeys": "event.user.profile.real_name_normalized",
+    "destKeys": "context.traits.name"
+  },
+  {
+    "sourceKeys": "event.user.profile.real_name",
+    "destKeys": "context.traits.name"
+  },
+  {
+    "sourceKeys": "event.user.profile.display_name_normalized",
+    "destKeys": "context.traits.name"
+  },
+  {
+    "sourceKeys": "event.user.profile.display_name",
+    "destKeys": "context.traits.name"
+  },
+  {
+    "sourceKeys": "event.user.profile.first_name",
+    "destKeys": "context.traits.firstName"
+  },
+  {
+    "sourceKeys": "event.user.profile.last_name",
+    "destKeys": "context.traits.lastName"
+  },
+  {
+    "sourceKeys": "event.user.profile.image_original",
+    "destKeys": "context.traits.avatar"
+  },
+  {
+    "sourceKeys": "event.user.profile.title",
+    "destKeys": "context.traits.title"
+  }
+]

src/v0/sources/slack/transform.js

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+const sha256 = require('sha256');
+const { TransformationError } = require('@rudderstack/integrations-lib');
+const Message = require('../message');
+const { mapping, tsToISODate, normalizeEventName } = require('./util');
+const { generateUUID, removeUndefinedAndNullValues } = require('../../util');
+const { JSON_MIME_TYPE } = require('../../util/constant');
+const { EventType } = require('../../../constants');
+
+/**
+ * Transform event data to RudderStack supported standard event schema
+ * @param {Object} slackPayload - The complete data received on the webhook from Slack
+ * @param {Object} slackPayload.event - The data object specific to the Slack event received. Has different schema for different event types.
+ * @returns {Object} Event data transformed to RudderStack supported standard event schema
+ */
+function processNormalEvent(slackPayload) {
+  const message = new Message(`SLACK`);
+  if (!slackPayload || !slackPayload.event) {
+    throw new TransformationError('Missing the required event data');
+  }
+  switch (slackPayload.event.type) {
+    case 'team_join':
+      message.setEventType(EventType.IDENTIFY);
+      break;
+    case 'user_change':
+      message.setEventType(EventType.IDENTIFY);
+      break;
+    default:
+      message.setEventType(EventType.TRACK);
+      break;
+  }
+  message.setEventName(normalizeEventName(slackPayload.event.type));
+  if (!slackPayload.event.user) {
+    throw new TransformationError('UserId not found');
+  }
+  const stringifiedUserId =
+    typeof slackPayload.event.user === 'object'
+      ? slackPayload.event.user.id
+      : slackPayload.event.user;
+  message.setProperty(
+    'anonymousId',
+    stringifiedUserId ? sha256(stringifiedUserId).toString().substring(0, 36) : generateUUID(),
+  );
+  // Set the user id received from Slack into externalId
+  message.context.externalId = [
+    {
+      type: 'slackUserId',
+      id: stringifiedUserId,
+    },
+  ];
+  // Set the standard common event fields. More info at https://www.rudderstack.com/docs/event-spec/standard-events/common-fields/
+  // originalTimestamp - The actual time (in UTC) when the event occurred
+  message.setProperty(
+    'originalTimestamp',
+    tsToISODate(slackPayload.event.ts || slackPayload.event.event_ts || slackPayload.event_time),
+  );
+  // sentAt - Time, client-side, when the event was sent from the client to RudderStack
+  message.setProperty('sentAt', tsToISODate(slackPayload.event_time));
+  // Map the remaining standard event properties according to mappings for the payload properties
+  message.setPropertiesV2(slackPayload, mapping);
+  // Copy the complete Slack event payload to message.properties
+  if (!message.properties) message.properties = {};
+  Object.assign(message.properties, slackPayload.event);
+  return message;
+}
+
+/**
+ * Handles a special event for webhook url verification.
+ * Responds back with the challenge key received in the request.
+ * Reference - https://api.slack.com/apis/connections/events-api#subscribing
+ * @param {Object} event - Event data received from Slack
+ * @param {string} event.challenge - The challenge key received in the request
+ * @returns response that needs to be sent back to the source, alongwith the same challenge key received int the request
+ */
+function processUrlVerificationEvent(event) {
+  const response = { challenge: event?.challenge };
+  return {
+    outputToSource: {
+      body: Buffer.from(JSON.stringify(response)).toString('base64'),
+      contentType: JSON_MIME_TYPE,
+    },
+    statusCode: 200,
+  };
+}
+
+/**
+ * Checks if the event is a special url verification event or not.
+ * Slack sends this event at the time of webhook setup to verify webhook url ownership for the security purpose.
+ * Reference - https://api.slack.com/apis/connections/events-api#subscribing
+ * @param {Object} event - Event data received from Slack
+ * @param {string} event.challenge - The challenge key received in the request
+ * @param {string} event.type - The type of Slack event. `url_verification` when it is a special webhook url verification event.
+ * @returns {boolean} true if it is a valid challenge event for url verification event
+ */
+function isWebhookUrlVerificationEvent(event) {
+  return event?.type === 'url_verification' && !!event?.challenge;
+}
+
+/**
+ * Processes the event with needed transformation and sends back the response
+ * Reference - https://api.slack.com/apis/connections/events-api
+ * @param {Object} event
+ */
+function process(event) {
+  const response = isWebhookUrlVerificationEvent(event)
+    ? processUrlVerificationEvent(event)
+    : processNormalEvent(event);
+  return removeUndefinedAndNullValues(response);
+}
+
+exports.process = process;

src/v0/sources/slack/util.js

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+/* eslint-disable no-restricted-syntax */
+const path = require('path');
+const fs = require('fs');
+
+const mapping = JSON.parse(fs.readFileSync(path.resolve(__dirname, './mapping.json'), 'utf-8'));
+
+/**
+ * Converts a Slack timestamp to RudderStack's standard timestamp format - ISO 8601 date string.
+ * The Slack timestamp is a string that represents unix timestamp (seconds since the Unix Epoch)
+ * with fractional seconds for millisecond precision.
+ * If the timestamp is not provided, the function returns the current date and time in ISO 8601 format.
+ *
+ * @param {string} [slackTs] - The Slack timestamp to be converted.
+ * @returns {string} The ISO 8601 formatted date string corresponding to the given Slack timestamp
+ * or the current date and time if no timestamp is provided.
+ *
+ * @example
+ * // Convert a Slack timestamp to an ISO 8601 date string
+ * const slackTimestamp = "1609459200.123000";
+ * const isoDate = tsToISODate(slackTimestamp);
+ * console.log(isoDate); // Output: "2021-01-01T00:00:00.123Z" (depending on your timezone)
+ */
+function tsToISODate(slackTs) {
+  // Default to current date if slackTs is not provided
+  if (!slackTs) return new Date().toISOString();
+
+  // Convert slackTs string into unix timestamp in milliseconds
+  const msTimestamp = parseFloat(slackTs) * 1000;
+  // Convert to a date object
+  if (Number.isNaN(msTimestamp)) {
+    // If timestamp was not a valid float, the parser will return NaN, stop processing the timestamp further and return null
+    return null;
+  }
+  const date = new Date(msTimestamp);
+
+  // Return the date in ISO 8601 format
+  return date.toISOString();
+}
+
+/**
+ * Converts an event name from snake_case to a RudderStack format - space-separated string with each word capitalized.
+ * @param {string} evtName - The event name in snake_case format to be normalized.
+ * @returns {string} The normalized event name with spaces between words and each word capitalized.
+ *
+ * @example
+ * // Convert a slack event name to RudderStack format
+ * const eventName = "member_joined_channel";
+ * const normalizedEventName = normalizeEventName(eventName);
+ * console.log(normalizedEventName); // Output: "Member Joined Channel"
+ */
+function normalizeEventName(evtName) {
+  return evtName
+    .split('_')
+    .map((s) => s.charAt(0).toUpperCase() + s.slice(1))
+    .join(' ');
+}
+
+module.exports = { mapping, tsToISODate, normalizeEventName };